__setfpucw - phpMan

__SETFPUCW(3)              Linux Programmer’s Manual             __SETFPUCW(3)



NAME
       __setfpucw - set fpu control word on i386 architecture (obsolete)

SYNOPSIS
       #include <i386/fpu_control.h>

       void __setfpucw((unsigned short) control_word);

DESCRIPTION
       __setfpucw transfers control_word to the registers of the fpu (floating point unit)
       on i386 architecture. This was used to control floating point  precision,  rounding
       and floating point exceptions.

EXAMPLE
       __setfpucw(0x1372)

       Set fpu control word on i386 architecture to
            - extended precision
            - rounding to nearest
            - exceptions on overflow, zero divide and NaN

AVAILABILITY
       As of glibc 2.1 this function does not exist anymore.  There are new functions from
       ISO C99, with prototypes in /usr/include/fenv.h, to  control  fpu  rounding  modes,
       like  fegetround,  fesetround,  and  the floating point environment, like fegetenv,
       feholdexcept, fesetenv, feupdateenv and fpu exception handling, like feclearexcept,
       fegetexceptflag, feraiseexcept, fesetexceptflag, fetestexcept.

       If  direct  acces  to  the  FPU  control  word  is still needed, the _FPU_GETCW and
       _FPU_SETCW macros from /usr/include/fpu_control.h can be used.

SEE ALSO
       feclearexcept(3)
       /usr/include/i386/fpu_control.h



i386 Linux Man Page               1997-03-08                     __SETFPUCW(3)

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